The 1883 Bruce by-election was a by-election held on 29 June in the Bruce electorate during the 8th New Zealand Parliament.
The by-election was caused by the death on 16 May of the incumbent MP James Rutherford.
On a show of hands Mr Gillies won, but the third candidate William A. Mosley demanded a poll. 
The by-election was won by James McDonald.
However in the 1884 election Gillies won the seat and McDonald came third.
The following table gives the election result:
|Independent||William A. Mosley||89||8.79|
- ^ "Bruce Election". Otago Daily Times. 25 June 1883 – via Papers Past.
- ^ "Bruce Election". New Zealand Times. 25 June 1883 – via Papers Past.
- ^ "Bruce Election". Otago Daily Times. 13 July 1883.